Learning Python Networking - Second Edition

Subnetting in Python

Another use case is an IP subnetting application, which gives you the required IP subnets based on required network size or amount of networks per location. We can also find the subnet information from the IPv4Network objects, as follows:

>>> net4.subnets() <generator object _BaseNetwork.subnets at 0x02F2C0C0>>>> subnets = list( net4.subnets())>>> subnets [ IPv4Network('10.0.1.0/25'), IPv4Network('10.0.1.128/25') ]

The ipaddress module includes many functions to create subnets and supernets; for example, we can use these methods to check whether a network overlaps with another:

>>> ipnet = ipaddress.IPv4Network("10.2.0.0/16")>>> list(ipnet.subnets()) [IPv4Network('10.2.0.0/17'), IPv4Network('10.2.128.0/17')]

The subnets(prefixlen_diff=1, ...